The government owns all the equipment, probably 95% of the radars, plus all the AWOS, Buoys, Weather Satellites, observation aircraft, weather balloons, and they have NOAA collect it all and run it through huge supercomputers. Everyone else is just re-publishing the same crud you can get directly from NOAA.
I have recently found on NOAA, a link to offshore weather buoys operated by NOAA. Some only give wave height, but many also give water and air temp, wind speed and wind direction including gusts, wave height, period and direction, barometric pressure and dew point.
http://www.ndbc.noaa.gov/
For local current conditions, updated every 60 seconds, you can call up a local AWOS.